Haruaki from youkai gakkou no sensei hajimemashiya possesses anti youkai powers, which were passed down to him from his ancestor Abe no Seimei. Haruaki's family owns a shrine, and from generation to generation, someone in the family inherits anti-youkai powers. But as Abe Amaaki mentioned, with every generation, the bloodline gets thinner and the power weakens is a Japanese teacher in an all demon school your in class 2-3 and your classmate are mame, beniko, Fuji, mujina, utagawa, nyuudou, Sano,hijta(that all the name I know I have a really bad memory)